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The character used as the thousands separator In the United States, this character is a comma (,). In Germany, it is a period (.). Thus one thousand and twenty-five is displayed as 1,025 in the United States and 1.025 in Germany. In Sweden, the thousands separator is a space.
Try N0 for no decimal part:
string formatted = a.ToString("N0"); // 10,000,000
You can also do String.Format:
int x = 100000;
string y = string.Empty;
y = string.Format("{0:#,##0.##}", x);
//Will output: 100,000
If you have decimal, the same code will output 2 decimal places:
double x = 100000.2333;
string y = string.Empty;
y = string.Format("{0:#,##0.##}", x);
//Will output: 100,000.23
To make comma instead of decimal use this:
double x = 100000.2333;
string y = string.Empty;
y = string.Format(System.Globalization.CultureInfo.GetCultureInfo("de-DE"), "{0:#,##0.##}", x);
a.ToString("N0")
See also: Standard Numeric Formatting Strings from MSDN
A simpler String.Format option:
int a = 10000000;
String.Format("{0:n0}", a); //10,000,000
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